// copy from element-plus



import type { CSSProperties, Plugin } from 'vue';



type OptionalKeys<T extends Record<string, unknown>> = {

  [K in keyof T]: T extends Record<K, T[K]> ? never : K;

}[keyof T];



type RequiredKeys<T extends Record<string, unknown>> = Exclude<keyof T, OptionalKeys<T>>;



type MonoArgEmitter<T, Keys extends keyof T> = <K extends Keys>(evt: K, arg?: T[K]) => void;



type BiArgEmitter<T, Keys extends keyof T> = <K extends Keys>(evt: K, arg: T[K]) => void;



export type EventEmitter<T extends Record<string, unknown>> = MonoArgEmitter<T, OptionalKeys<T>> &

  BiArgEmitter<T, RequiredKeys<T>>;



export type AnyFunction<T> = (...args: any[]) => T;



export type PartialReturnType<T extends (...args: unknown[]) => unknown> = Partial<ReturnType<T>>;



export type SFCWithInstall<T> = T & Plugin;



export type Nullable<T> = T | null;



export type RefElement = Nullable<HTMLElement>;



export type CustomizedHTMLElement<T> = HTMLElement & T;



export type Indexable<T> = {

  [key: string]: T;

};



export type Hash<T> = Indexable<T>;



export type TimeoutHandle = ReturnType<typeof global.setTimeout>;



export type ComponentSize = 'large' | 'medium' | 'small' | 'mini';



export type StyleValue = string | CSSProperties | Array<StyleValue>;



export type Mutable<T> = { -readonly [P in keyof T]: T[P] };